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(No Model.)

J. D. SMITH.

GUMBINED SQUARE AND PROTRAGTOR. No. 388,734. 4 Patented Aug. 28, 1888.

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UNITED STATES PATENT @Enron JOSEPH D. SMITH, OF RISING CITY, NEBRASKA.

COMBINED SQUARE AND PROTRACTOR.

SPECIFICATION forming part of Letters Patent No. 388,734-, dated August28, 1888.

Application filed May 5, 188B.

To all whom it may concern:

Be it known that I, JosEPn D. SMITH, a citizen of the United States ofAmerica, residing at Rising City, inthe county of Butler and State 0fNebraska, haveinvented certain new and usefullmprovements in Squares;and I do hereby declare the following to be a full, clear, and exactdescription of the invention,such as will enable others skilled in theartto which itappertains to make and use the same, reference being hadto the accompanying drawings, and to letters or figures of referencemarked thereon, which form a part of this specification.

My invention relates to certain new and useful improvements incarpenters squares, the object ofthe same being to provide a square withan extensible portion which can be eX- tended to increase thestraight-edge and adjust the angle-arm thereof in and ontfrom the bodyof the square; also, in providing such a square with an adjustablemember for meas` nring or laying off angles; and it consists in theconstruction and combination of the parts, as will be hereinafter fullyset forth, and specifically pointed out in the claims.

In the accompanying drawings, Figure lis a side view of my improvedtry-square,show ing the saine partly broken away to bet-ter showtheinterior construction. Fig. 2 is an edge view. Fig. 3 is a detailview. Fig. 4is a sectional view through line a; fr, Fig. 1.

A refers to the body portion of the squai e, which is made up of twoplates rigidly connected to each other by an angle block, B, and rivetb. One ofthe plates A has rigidly connected thereto a slot-ted arc, C,provided with suitable graduations or marks. rIhe edges ofthe slot arebeveled, as shown ate c, so that the sliding nut d will engage therewithwithout extending above the edge thereof. The slot is closed at itsupper end.

The sliding member D, which carries the arm at right angles therewith,is provided with a longitudinal slot, D', through which the rivet bpasses, said rivet preferably maintaining in place a small block, b',having beveled edges which engage with the beveled edges el of the slotD', and the set-screw E, which locks the sliding member in position,

passes through one of the plates A', through Serial No. 272.927. (Nomodel.)

the perforation in the nut E', and engages with a screw-threadedperforation in the opposite pla-te A', thus permitting the member D tohave a steady sliding movement between the plates. If desirable, theremay be placed in the slot D', instead of the nuts E and b', one ofconsiderable length, through which the setscrew may pass.

To the end of the straight-edge A,by means of asingle pin, F, is securedan adjustable arm, G, which has formed integral with its upper end asegmental or areshaped member, I-I, which is secured to the slot of thearcshaped member O by a suitable set-screw.

The lower portion of the arm G has a slot, g,

through which the pin F passes, and when this arm G is adjusted the pinwill move in the slot and the point g will be held at the point of thesquare. The lower portion of the arm G is of such configuration that itwill abut snugly against the angle-block B when placed at an angle offorty-five degrees, or thereabout, with the straight edge A.

Having thus described my invention, I claim- 1. The conibinatiomin acarpenters square having a slotted arcshaped member,O, of the arm G,with a projecting arc-shaped member, H, adapted to be connected to thearm C bya set-screw, the lower end thereof having a slot, g, above itspoint, and a pin, F, connecting the parts to each other,substantiall yas shown, and for the purpose set forth.

2. The combinatiomin a carpenters square, of the side plates, A',connected to each other rigidly at one end by an angle-block, B, andnear the opposite end by a rivet, a slotted L- square connected theretoso as to be longi tudinally adjustable,one ofthe side plates A', havinga slotted are -shaped member, C, the arm G,having a curved member, H,means for connecting the same to the member C, and a segmental slot, g,through which a pin, F, passes, the parts being organized substantiallyas shown, and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

JOSEPH D. SMITH.

IVitnesses:

S. A. REIoHENnnon, J. A. REICHENBACH.

